I have a pair of Remington rifled chokes, but try finding a Remington SxS shotgun threaded for Remchokes in Australia!!

MacNaughton:
That's interesting about the fixed rifled choke in one barrel of the Fabarm, they were definitely fully-rifled in one barrel when they first tried this years ago, in the early days of 12-bore sabots. Looks like they've changed their tune.

Do you reckon we could get them to make up a couple with fixed paradox chokes in both barrels? You're right about the barrel-length though, 24-inches is certainly not 'pukka' for a paradox!